There are more large-scale pregnancy trials that implement lifestyle interventions than ever before; yet, there is a dearth of information on pregnant peoples’ experiences in such trials. Contemporary lifestyle pregnancy trials draw on epigenetics and DOHaD research to design and justify prenatal interventions on the material environment to reduce health risks in future generations. This article draws on ethnographic data from a prenatal trial in the United Kingdom and focuses specifically on the experiences of pregnant participants during the intervention phase. (...) In this article, I develop the politics of postgenomic reproduction as a feminist and critical race framework to examine the complex and mercurial stakes of contemporary pregnancy trials. I argue that narratives of control and responsibility in epigenetic models are echoed and preceded by participants’ own embodied experience. The pregnant narratives show at once how their bodies are exposed to unpredictable and uncontrollable environmental exposures and that they are required to respond as if they have absolute control and responsibility. Attending to trial participants’ narratives from a feminist and critical race framework reveals how individualized lifestyle interventions are deeply political and racial, and carry implications for how pregnancy trials influence postgenomic reproduction. (shrink)